UM9995 Datasheet, PDF (1/3 Pages) Microsemi Corporation – ULTRA LOW MAGNETIC MRI SWITCHING DIODES

UM9995
ULTRA LOW MAGNETIC MRI SWITCHING
DIODES
DESCRIPTION
The UM9995 was developed for switching applications in MRI systems
that require an ultra low magnetic image. The UM9995 is also excellent
for shunt mount applications with good switch performance from VHF
and higher. The selection of the proper materials for the package insures
the minimum magnetic image required for MRI applications. The
performance is achieved using discrete low inductance PIN diodes
assembled with special hardware to permit good electrical and
mechanical properties The Microsemi UM9995 PIN diode is constructed
using a fused-in-glass process, which results in a highly reliable, hermetic
package. The process utilizes symmetrical, full faced metallurgical bonds
to both surfaces of the silicon chip. This construction greatly minimizes
the normal parasite inductance and capacitance found in conventional
glass or ceramic packaged diodes, which employ straps, springs, or
washers.
KEY FEATURES
9 Ultra low magnetic
construction
9 Low inductance
package
9 High power handling
capability
9 Low bias current
requirement
9 Excellent distortion
properties
9 Passivated chip
9 Metallurgical bond
9 Non-cavity design
9 Thermally matching
configuration
9 Available in surface or
shunt mount packages
This is an actual
Magnetic Image of the
standard UM9601 and
the specially constructed
UM9995 PIN diode (in
a 3T MRI system).
Fig. 1 Image of the UM9995 compared to standard Switch diode
Copyright  2004
Rev. 0, 2004-10-15
Microsemi
Page 1